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Thread: So, give us new LCD touchscreen options!

  1. #201
    MySQL Error jcdillin's Avatar
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    Quote Originally Posted by old_lou
    Somebody on Ebay flogging hi output led's he may be able to find you something cheaper Scouse?

    http://cgi.ebay.co.uk/ws/eBayISAPI.d...768159332&rd=1

    i've already ordered the luxeon stars which are the brightest i've been able to find.
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  2. #202
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    Quote Originally Posted by jcdillin
    but with playing with diffrent diffusers and other options I just dont think the current backlight has the light output needed to bump up the brightness, even with new reflecters and polarizer sheets.
    Thats why we are going with the more ccfl tube approach, personally i'm not in this to make money, i'm trying to find us DIY'ers a way to get the brightness to a useable level.
    The point is that the one-way mirror film uses the incoming sunlight to boost the brightness - proportionally to the brightness of the sunlight. Hence you don't need a brighter CFL behind there. You don't need the additional circuit to adjust the output of the new super-bright CFL. Etc.

    If we can find suitable reflective sheets, I think it'll be cheaper than building a new/additional CFL.

    The layout would then be (back to front):

    CFL + optical assembly
    diffusers
    one-way reflective sheet
    lcd
    anti-reflective sheet / contrast enhancing sheet of some kind

    This is the basic arrangement of most daylight readable LCDs out there. The other kind are ones which only have very bright CFLs but they are less common and, from what I've seen, more expensive. The most impressive sounding ones have all used the reflective approach in some form.
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  3. #203
    MySQL Error jcdillin's Avatar
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    Well that makes more sense, so in basic terms they are turning the LCD into a transreflective in a way.

    well if someone can source that film then lets go for it, could be another option.
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  4. #204
    Constant Bitrate
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    Will metal coated mylar work? I ran into this page a couple of minutes ago. Don't have time to look at it in detail right now, but it seems that this stuff may be what we are looking for, and it's pretty cheap...

    http://www.nielsensenterprises.com/snomo/mylar.htm

    -momanz

  5. #205
    Constant Bitrate
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    No im confused with what the hell is actually going on. I got it that the original CCFL is gone. We will be putting in the custom heater style CCFL with an inverter that incorporates full dimming control. Either by phototransistor or pot. And with the possibility of an AR film added to the front.

    Does that about cover it?

    Btw Scouse and Jcdillin, are you guys looking to do a group buy on the ccfl and transistor? I know you said you arent looking to make money but the last i saw the order for the CCFL had to me 200 peices = 100 kits total. So are you gonna try and get these kits together and sell them at little or no profit or are you trying to get a big number of people to buy in once the samples show up and you get working prototypes done?

  6. #206
    MySQL Error Scouse Monkey's Avatar
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    Sansoo, yeah we are going to mod a few screens 1st to see how it pans out.

    As for the transrefelctive films - i have this view of them.....

    A transreflective screen if done right can be a very good way of making your screen daylight viewable. A 300nit transreflective screen can be perfectly daylight readable but i have these issues:

    1. in a car enviroment you might have high ambient levels but low levels actually directly hitting the screen to bounce off which may lower the effectivness of the reflection as your eyes are adjusted to the bright ambient conditions

    2. Doing the transreflection mod may not simply be a case of just putting a transreflective layer into your screen. It amy have to have allthe polarisers replaced - including the outer one. The orientation of the transreflective film is certainly different to the normal polarisers.

    By increasing the brighness we are gviving ourselves every possible chance to improve these screens. The touchscreen overlays may also mess up the transreflective benefits as they are pretty crap and i think a stronger backlight gives us a good fight against this.

    The work ont he backlight would also improve the night time use by providing automatic dimming to all the screens (previously only the Xenarc had any dimming and this was via OSD). Gamma and skins can help but ultimately it is the brightness of the CCFLs that cause the night time viewing troubles.

    I can get 6.4" 300nit transreflective LCDs for 500 ($900) but that is before the TS takes 25% away. We are proposing something in the region of 800nit possibly with some transreflection.

    I also want to point out before people go out and buy/hassle suppliers for transrefllective film that the Xenarc does have a semi mirror bottom polariser already which does reflect some of the light and also let us do some research and let us provide you with some guides before you hack your screen apart as any dust will ruin it!

  7. #207
    Unregistered User ODYSSEY's Avatar
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    Keep up the good work. I am interested in the outcome.
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  8. #208
    The Curator
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    I have just stumbled upon this thread and am simply amazed...

    As for the outcome, I too can't wait. Maybe I will postpone my screen mod some more till this gets worked out, b/c I would MOST CERTAINLY get one of these Kits(?)

    And thanks Scouse Monkey/jcdillin for all that you are doing...a big comunity contrabution....
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  9. #209
    MySQL Error jcdillin's Avatar
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    Allright everyone, just wanted to give a status update.

    Finally after going back and forth with china about the ccfl tubes, we have decided on a design

    So I should be paying them for the samples today or tomorrow. Then the tubes will probably take about 2 to 3 weeks to get here. I have only ordered 3 sets of 2 diffrent diameter tubes so that I can test both.

    So I will keep everyone posted on the progress.
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  10. #210
    MySQL Error jcdillin's Avatar
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    Scouse, here is the voltage info you needed

    The starting voltage of the 2.6 mm tube is 1400-1500 V while the rated voltage is 800-900 V. The starting voltage of the 4.1 mm tube is 1360-1460 V while the rated voltage is 720-820 V
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